I'll try to answer some of these well:how much white water have you experienced in the pack raft? as much as I can. check out http://www.youtube.com/user/romandial for videos of whitewater and mixing packrafts with walking

how stable is it? Very stable.

i know there are some large rapids in the canyon.They are the fun ones -- like Hermit!

how much gear or weight can you carry. I have carried my wife and all our gear for a week. But prefer to keep it under 35 pounds and if running Class IV run an empty boat whenever possible

does it affect the handling. Yes. More weight = more effect

how many miles a day were you able to float. Depends on how long the days are. In the Grand Canyon we had short January days. I think we did maybe 15 miles a day?

because these boats are small and lite and don't track they are probably slower in the water than a large raft. Not necessarily -- it's really more about the water current for how far you go each day, but yes for moving around the river they are slower than kayaks, but possibly faster than a big oared raft (I have little experience!). They are surprisingly nimble -- watch as many of those videos as you can stomach to see that.

i would love to see more pics from other trips you have done. I do videos, not really pics.